Castrol Longlife 2 vs. SLX: Which is Best?

Hi.
While looking for a top-up oil for my PD engine with WIV technology, I found Castrol Longlife 2 TopUp at the hardware store for 19.90 EUR/liter .
Online (e***), however, Castrol SLX Longlife 2 with the same specifications is predominantly offered. Unfortunately, I can't find it on the official Castrol website. Are these products being sold online fake? The TopUp top-up oil is described on the Castrol website. A liter costs about 7 EUR online. With 5 liters, it definitely becomes worthwhile; provided it's not a 'copy' or a counterfeit. Or is it so new that Castrol hasn't updated its website yet?

I think they've probably just changed the name again.
And specifically, from SLX to TopUp.
I'm familiar with Castrol SLX, at least.
I wasn't familiar with TopUp before.
Definitely, the SLX is not a fake or anything like that.

Hmmm, the production date on the TopUp bottle from the hardware store was 01/2004. That would mean that the oil offered by e*** is almost a year old (or even older) .

Since even oil, when unused, is subject to a certain degree of degradation...

*rummaging through gossip and rumors*

Was stimmt es, dass SLX war früher eher als eine Marke für workshops gedacht, während TopUp als eine Marke für Heimanwender gedacht war? Aber der Inhalt sollte ja gleich sein??

*Speculations about the space-time continuum.*

Was stimmt es, dass SLX war früher eher als eine Marke für workshops gedacht, während TopUp als eine Marke für Endverbraucher gedacht war? Aber der Inhalt sollte ja gleich sein??


Okay, TopUp as a refill container for aftermarket products. SLX is for workshops and similar businesses, but the contents should be the same.

Thank you.
'Then I can freely add more juice. Because almost 20 euros for a liter is probably quite excessive. That's bordering on price gouging. But the oil companies are probably all in cahoots.'